JPS6151540B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a bead forming device used in an automobile tire forming process, and in particular to a manpower-saving and compact bead forming device that can automatically attach a bead filler and a flipper onto the outer peripheral surface of a bead wire. The object of the present invention is to provide a bead forming device that can accomplish the following.

Generally, bead fillers with a roughly triangular cross section are attached to the outer circumferential surface of bead wires for the beads of automobile tires, but in radial tires, which have recently become more popular, Tall bead fillers are used to increase the stiffness of the tire sidewall.

Bead fillers are usually extruded into a predetermined shape using a rubber extruder, but in this case, the resistance to the extrusion die is greater on the side of the bead filler that corresponds to the thinner part of the tip than on the side that corresponds to the thicker part of the base. In the extruded bead filler, the edge length of the tip is shorter than the edge length of the base.

Therefore, when pasting a bead filler on the outer circumferential surface of the bead wire, the sword tip does not stand up and lies down, and conventional bead forming equipment only has simple guiding and pasting functions, so it is not normal. Since pasting is impossible and requires the labor of workers, there was a strong desire for improvement measures.

Separately, tires with a bead structure in which the outer periphery of the bead to which a bead filler is attached are further wrapped with a flipper made of rubber-coated fabric have recently been widely used. Since the process was carried out using a separate device from the attachment process, it required a large amount of man-hours and a large space for machine installation and material storage, which were unavoidable.

Although the work contents of pasting bead filler and pasting flipper are very similar, it is extremely uneconomical to perform them separately as separate work, which is why rationalization is desired.

In addition, conventionally, the typical method for removing formed beads from a bead forming device is to rapidly extrude them using a discharge rod, but with this method, the approach of the beads to the receiving means is uncertain, and the overall In the bead forming process, where streamlining is becoming widespread, it is extremely unreasonable to require a lot of man-hours to discharge the beads, and improvements in this aspect are strongly desired.

In view of these facts, the present invention enables automatic molding of relatively tall bead fillers without requiring any manual labor except for gluing the ends of the bead filler, thereby eliminating the conventional defects as described above. This was done in an attempt to provide a new bead forming device that can completely eliminate the
The specific contents will be explained in detail below with reference to the attached drawings.

FIG. 1 shows a front view of an example of a bead forming apparatus according to the present invention. It is composed of a flipper end advancing pressing mechanism 7 and a flipper sending mechanism 8, which are arranged compactly as shown in the figure.

The structure of each of the mechanisms 2 to 8 described above will be explained below.

(a) Bead filler supply guide mechanism 2, from which the bead filler A extruded from the rubber extruder in the previous process (not shown) is naturally suspended, passes through the front guide roller group 14 and the rear guide roller group 15 to the next bead filler cutting mechanism 3. This is a mechanism for guiding, and the main structure is illustrated in FIGS. 2 and 3.

Reference numeral 11 denotes a phototube installed in the suspension part of the bead filler, which detects the lowest part of the suspended bead filler and stops the operation of the rubber extruder when the light is blocked, and conversely, when exposed to light, extrudes the rubber. Start the machine.

Reference numeral 12 denotes a guide roller, which is formed to guide the bead filler A of the suspended portion approximately onto the center line of the supply guide mechanism 2.

Reference numeral 13 denotes a reverse movement prevention roller, which is rotated only in the counterclockwise direction in FIG. ,
It is placed in sliding contact with the bead filler A under tension.

The front guide roller group 14 has a plurality of rollers that are erected with one side inclined toward the outside, and as is clear from FIG. 2, the inclination decreases toward the front and approaches vertical. Arranged.

On the other hand, the rear guide roller group 15 includes a pair of left and right rollers 16, 1 arranged in a row at an angle toward the front.
6' and a horizontal roller 17 placed horizontally just below the pair of rollers 16, 16'. Hold bead filler A at its bottom and both sides.

Both guide roller groups 14 and 15 are both provided on a sliding plate 18, and sliding bearings 21 and 21' are fitted into guide rods 20 and 20' provided on a bottom plate 19 fixed to the frame 1. The sliding plate 18 has a bearing 21, 21' and the bottom plate 19 connected by a fluid cylinder 22, so that as the fluid cylinder 22 moves forward and backward, both guide roller groups 14, 15 move. It can be moved forward and backward as one unit.

(b) Bead filler cutting mechanism 3 This is a mechanism for lowering the scissors-like cutter 31 to the feeding end of the bead filler supply and guide mechanism 2 to cut the bead filler A that is being guided and fed.

The scissor-like cutter 31 has a structure in which a pair of blades 33 attached to a pivot shaft 32 are connected to a rod of a fluid cylinder 35 via a link 34, and is attached to a mounting plate 36.

The mounting plate 36 can be fixed to the horizontal sliding plate 41 by an arcuate groove 42 while maintaining an arbitrary angle.On the other hand, the horizontal sliding plate 41 can be fixed to the horizontal sliding plate 41 by two horizontal guides provided on the lifting plate 39. It is slidably loaded on the rod 40.

Further, the elevating plate 39 is slidably mounted on two vertical guide rods 38 arranged in parallel with a vertical plate 37 provided on the frame 1.

The horizontal sliding plate 41 has a female screw portion that is screwed into an adjusting screw 43, and can be slid in the horizontal direction by rotating a handle 44.

Reference numeral 45 denotes a fluid cylinder, which is supported by a vertical plate 37 and whose tip end engages with an elevating plate 39.

By creating such a structure, the scissor-shaped cutter 3
1 is raised and lowered by the operation of the fluid cylinder 45, and moved forward and backward by rotating the handle 44, and the fluid cylinder 3
5 opens and closes to cut the bead filler A at a predetermined position and retreat after cutting.

(C) Pressure Roller Mechanism 4 This is a mechanism for pressing the base of the bead filler A onto the outer circumferential surface of the bead wire B on the bead drive roller 50 while sandwiching the base of the bead filler A from both sides by the two pressure rollers 51 and 51'.

As shown in FIG. 4, the bead drive roller 50 has a groove in the center into which the bottom of the bead filler A can fit, and the left and right sides of the groove are tapered to become larger diameters as they move away from each other. It is pivotally supported by the frame 1 and rotated around a fixed rotating shaft by a drive means (not shown).

As shown in FIG. 4, the pressure rollers 51 and 51' are rotatably held by holding plates 52 and 52', respectively.

On the other hand, the retaining plates 52 and 52' are connected to the pivot shafts 54 and 5.
4' are pivotally held on the sliding pieces 53, 53' through the respective circular grooves 55, 55' provided in the retaining plates 52, 52' and protruding from the sliding pieces 53, 53'. It can be fixed at a desired swing angle position by using the bolts 56, 56'.

Reference numeral 57 is an upright frame provided on the frame 1 of the bead forming apparatus and supports a fluid cylinder 58.

A sliding block 60 is slidably engaged with the upright frame 57 by a sliding guide 61 shown in FIG. Ru.

With the above structure, when the fluid cylinder 58 is actuated, the sliding block 60 moves up and down in the vertical direction.

Reference numeral 62 denotes a shaft rotatably provided on the sliding block 60, on which a pinion 63 is integrally fitted via a key 64, and has a left-right symmetrical threaded portion at the tip for sliding movement. Pieces 53 and 53' are screwed into the threaded portions, respectively.

Reference numeral 65 denotes a sliding guide rod that is slidably pivotally connected to the sliding block 60 via a sliding key 66 (see Fig. 5), and is loosely fitted into holes provided in the sliding pieces 53, 53'. ing.

A rack 67 is engaged with the pinion 63, and the tip of the rack is connected via a connecting plate 68 to the rod end of a fluid cylinder 69 held on the sliding block 60.

With such a structure, when the fluid cylinder 69 is operated, the rack 67 moves up and down, rotates the shaft 62 via the pinion 63, and rotates the sliding piece 5.
Pressure rollers 51, 5 connected to 3, 53'
1' are closely spaced from each other.

Note that 72 in FIG. 1 is a flange provided on the roller 70 for regulating the lateral position of the bead filler A, and 70' is a bead inner circumference guide roller provided separately.

(d) Flipper pressing mechanism 5, which is used to press the flipper against the bead wire B by a pair of conical rollers 73' and 73''.

Reference numeral 73 denotes a flipper pressing means, which is generally used to clamp and press the flipper in the generatrix area of two conical rollers 73' and 73'' (arranged in the front-rear direction perpendicular to the plane of the paper in FIG. 1). By sliding the rack 74 and rotating the pinion 75 by a fluid cylinder (not shown), the outer conical roller 73' is rotated around the shafts 76, 76', and the inner conical roller 73' is rotated around the shafts 76, 76'. 73'', making it convenient to attach and detach the bead B to and from the bead forming apparatus.

Therefore, when the two conical rollers 73', 73'' are connected, the bevel gears 77, 77, which are coaxially integrated with the rollers 73', 73'', mesh with each other, and a worm deceleration is performed by a driving means (not shown). It is driven via a machine 78.

This flipper crimping means 78 can be moved horizontally close to and away from the bead B by rotating the handle 79, and can be raised and lowered vertically by means of an adjusting screw 80. Optimum positioning can be achieved in accordance with B.

Note that the arcuate groove 80' allows the conical rollers 73', 7
The inclination of 3″ can be adjusted.

(e) Bead lower part holding mechanism 6 The main structure is shown in Figs. 6 and 7, and this mechanism 6 holds the lower part of the endless bead wire B running during the bead forming operation and holds the lower part of the bead wire next to the bead wire. This is a mechanism to maintain tension while preventing deviation.

Each member is arranged on a holding plate 81 attached to the frame 1 of the bead forming machine, and a fluid cylinder 82 fixed to the holding plate 81 has the tip of the piston rod locked to an elevating plate 83. By supplying pressure fluid to 82, the elevating plate 83 can be moved up and down.

Reference numeral 84 denotes a horizontal roller rotatably provided on the elevating plate 83, which contacts the inner circumferential surface of the hanging portion of the bead B and pulls it downward when descending.

85, 85' are upright rollers rotatably supported by the elevating plate 83, 86 is a shaft pivotally supported by the elevating plate 83, and swing arms 87, 88, 88' are connected via keys.
is fitted.

The tip of the swinging arm 87 is connected to a fluid cylinder 89 that is locked to the lifting plate 83 by a connecting piece 90 and a pin 91, and by supplying pressure fluid to this cylinder 89, the swinging arm 87 is made to swing in the vertical direction together with the other arms 88, 88'.

The swing arms 88, 88' have rollers 92,
92' is rotatable and is provided vertically in the fully retracted position of the piston rod of the hydraulic cylinder 89, and these rollers 92, 92'
is in a vertical state, the upright rollers 85, 8
5' and are arranged side by side with a predetermined distance between them.
The hanging part of the bead B inserted in this gap is held from both sides and serves to restrict lateral deviation, and on the other hand,
When the piston rod of the hydraulic cylinder 89 extends and the swinging arms 87, 88, 88' swing counterclockwise, the rollers 92, 92' move in a direction in which their lower ends approach the upright rollers 85, 85'. By tilting, the bead B is formed between the upright rollers 85 and 85'.
It operates by pinching from both sides.

(f) Flipper end forward pressure welding mechanism 7 The main parts of this mechanism are shown in FIG. 8 and FIG. However, they are attached so that their width centers match and are fed out toward the bead drive roller 50.

Each member is associated with a holding plate 100 attached to the frame 1 of the bead forming apparatus, and the holding plate 100 has guide rods 101, 10 in the vertical direction.
2 is permanently installed.

103 is a sliding plate and sliding bearings 104, 10
4', 105 to be slidably mounted on guide rods 101, 102, and is raised and lowered by a fluid cylinder 106 provided on the holding plate 100.

107 is a horizontally provided guide roller, and 108 is a presser plate, both of which are attached to the sliding plate 103, and the presser plate 108 is fixed to a shaft 109 that is horizontally arranged and rotatably supported on the sliding plate 103. has been
A protruding plate 110 is provided on the shaft 109, and a protrusion 1 fixed to the protruding plate 110 and the sliding plate 103 is connected to the protruding plate 110.
11 through a spring 112, the pressing plate 108 is always pressed against the sliding plate 103 by the elasticity of the spring 112.

113 is a flipper cutting means, which is operated for cutting by a fluid cylinder 114 for driving a cutting blade.

Reference numeral 115 denotes a notch cut out from the upper end of the sliding plate 103, and is provided directly above the presser plate 108, so that when the sliding plate 103 is raised, it is suspended from the bead driving roller 50. It is provided to approach the endless bead wire B suspended from below at a portion immediately before the bead wire support point of the bead drive roller 50 and to engage the corresponding portion of the bead wire B into the notch 115. .

The forward pressing mechanism 7 is fixed at an appropriate inclination according to the diameter of the bead wire B by using arcuate grooves 116 and 117 (see FIG. 1) provided in the frame 1.

(g) Flipper feed mechanism 8, this mechanism is made up of bead wire B and bead filler A.
This is for causing the flipper end advancing press mechanism 7 to send out the flipper to be wrapped around the core body which is integrated with the flipper end.

A flipper 140 is wound around a liner inserted into a delivery shaft 141.

A brake means 142 is provided on the delivery shaft 141 to apply appropriate braking.

143 and 144 are drive rollers, and 145 is a liner wound by the drive roller 144 onto a winding box loaded onto a winding shaft 146.

The winding shaft 146 is pivotally supported at the tip of a swinging arm 147 that is swingably supported by a shaft 148, and a piston rod of a fluid cylinder 149 that is locked to the frame is connected to this arm 147.
By feeding pressure fluid into the cylinder 149, the take-up shaft 146 swings between a standby position and an operating position, and in the operating position, the liner 145 is pressed against the driving roller 144, thereby removing the liner being fed. can be rolled up.

150 is a speed reducer driven by a prime mover (not shown), and a sprocket wheel 151 is attached to the output shaft.
, and the driving roller 1 is connected by the conductive chain 152.
It is linked to 44 sprocket wheels.

The driving roller 143 is connected to a driving roller 144 through an intermediate shaft 153 through a gear and a transmission chain. Note that 155, 156, and 157 are guide rollers, 158 is a phototube device, and 159 is a pedestal, and the phototube device 158 is connected to the flipper 140.
The lower end of the naturally suspended portion is detected, the drive motor is stopped by blocking light, and the motor is driven by transmitting light.

The liner is then pulled out against the brake means 142 by the drive roller 144 and
The flipper 140 is wound around the winding shaft 146 through the rollers 155, 156.
57, drive rollers 143, 144, and a naturally suspended portion, passing over a pedestal 159 and being led to the flipper end advancing pressure contact mechanism 7.

Each mechanism has been explained above, and in FIG. 1, 130 is a guide roller, which is rotatably supported at the tip of a swinging arm 132 supported by a shaft 131 on the frame 1 of the bead forming apparatus. Depending on the diameter of the bead wire B to be inserted, it is appropriately positioned so as to make light contact with the inner circumferential surface of the bead wire B, and serves to smooth the rotation of the bead wire B.

Next, the operation mode for forming beads using the bead forming apparatus having the above-described structure will be explained.

The endless bead wire B is wrapped around the drive roller 50 and the guide rollers 70, 70', 130, and the upright rollers 85, 8 of the bead lower holding mechanism 6
5' and the swinging rollers 92, 92' and rotated below the horizontal roller 84.

Then, pressure fluid is fed into the fluid cylinder 82 of the bead lower holding mechanism 6, the piston rod is contracted, and the elevating plate 83 is lowered. 92' and pushed down by the horizontal roller 84 to tension the bead wire B.

Next, the flipper crimping conical roller 73' is brought into contact with the opposing conical roller 73'', and at the same time, pressure fluid is fed into the fluid cylinder 22 of the bead filler supply guide mechanism 2 to extend the piston rod, so that the piston rod is directly below the cutting blade 33. The distal end of the bead filler A is prevented from retreating by the reverse prevention roller 13, so it moves forward together with the sliding plate 18, and the guide rollers 16, 1 move forward together with the sliding plate 18.
6' and 17 prevent lateral deviation,
It moves to the outer peripheral surface of the bead wire B on the drive roller 50.

Next, the fluid cylinder 5 of the pressure roller mechanism 4
When pressure fluid is fed into the piston rod 8 to extend the piston rod, the sliding block 60 is lowered, so that the pressure rollers 51, 51' occupy positions sandwiching the tip of the bead filler A from the left and right sides.

At this time, by feeding pressure fluid into the fluid cylinder 69 to extend the piston rod, the rack 67 is lowered and the shaft 62 is rotated.
The sliding pieces 52, 52' are moved toward each other by symmetrical screws.

Therefore, the pressure rollers 51, 51' are in contact with both sides of the base of the bead filler A with only the lower portions being close to each other, and as a result, the base is strongly pressed from both sides without being obstructed by the sword tip of the bead filler A. Bead filler A is crimped onto the outer peripheral surface of bead wire B.

Simultaneously with the operation of the pressure roller mechanism 4, pressure fluid is fed into the fluid cylinder 106 of the flipper end advance pressure contact mechanism 7 to contract the piston rod and raise the sliding plate 103, which is then cut by the cutting means 113 and placed on standby. The flipper is presser plate 1
08, the bead wire B moves forward together with the sliding plate 103 over the cutting means 113 until it enters the notch 115, so that the tip of the flipper is pressed against the inner peripheral surface of the bead wire B.

Next, the drive roller 50 and the conical roller 73' are rotated, and the bead wire B is fed while successively pressing the bead filler A onto the outer surface of the bead wire B, and at the same time, the outside is wrapped with a flipper.

While the flipper passes through the pressing means 73, it is completely pressed against the conical rollers 73', 73''.

After a predetermined period of time has elapsed from the start of rotation of the drive roller 50, pressure fluid is fed into the fluid cylinder 22, the piston rod is contracted, and the bead filler supply guide mechanism 4 is moved backward, and at the same time, pressure fluid is fed into the fluid cylinder 106. Then, the piston rod is extended to lower the sliding plate 103 and return it to the original standby position.

After the bead filler supply guide mechanism 4 retreats,
When pressure fluid is fed into the fluid cylinder 45 of the bead filler cutting mechanism 3 and the piston rod is extended, the elevating plate 39 is lowered and the cutting means 31 is moved to the standby position.

In this case, the cutting blade 33 assumes a position in which the tip thereof is open and the bead filler A is held between them.

When the bead wire B rotates and the tip of the crimped bead filler is detected by a phototube device (not shown), a detector (not shown) begins to detect the moving length of the inner peripheral portion of the bead.

When this moving length reaches the set value, the drive roller 5
0 is stopped, and the bead filler cutting mechanism 3
Pressure fluid is introduced into the fluid cylinder 35 of the piston rod to retract the piston rod.

As a result, the cutting blade 33 closes and cuts the bead filler A. Immediately thereafter, by feeding pressure fluid into the fluid cylinder 45, the piston rod is contracted and the cutting means is raised to the separating position. Pressure fluid is fed into the fluid cylinder 35 to extend the piston rod, and the cutting blade 33 is opened and returned to the standby position.

Before and after the above-mentioned cutting operation of the bead filler A, the fluid cylinder 1 of the flipper cutting means 113
14, the piston rod is retracted to disconnect the flipper, and immediately thereafter the piston rod is extended and returned to the standby position.

Next, after a worker joins the rear end of the cut bead filler to the tip of the bead filler on the bead wire B, when the bead wire B is rotated by driving the drive roller 50 and the conical roller 73' again, the above-mentioned detection (not shown) occurs. The device starts detecting the moving length at the inner circumference of the bead again, and the bead filler A
When the rear end of the flipper is crimped to the bead wire B and the rear end of the flipper overlaps the front end of the flipper on the bead and reaches a predetermined length at which the conical roller 73' ends the crimping, the flipper is crimped with the drive roller 50. The rotation of the conical roller 73' is stopped, and at the same time, pressure fluid is supplied to the fluid cylinder 69 of the pressure roller mechanism 4 to raise the rack 67 and separate the pressure rollers 51 and 51' from each other. to open.

Subsequently, pressurized fluid is fed into the fluid cylinder 58 to raise the sliding block 60, and at the same time the pressure rollers 51, 51' are pulled up to the standby position, the flipper pressure conical roller 73' is released.

Next, the fluid cylinder 8 of the bead lower holding mechanism
When pressure fluid is fed into the piston rod 9 to extend the piston rod and swing the swinging arm 87 counterclockwise in FIG. 7, the lower ends of the rollers 92, 92' approach the upright rollers 85, 85'. Since the bead is inclined in the direction, the lower part of the bead is sandwiched between the upright rollers 85 and 85'.

Subsequently, pressure fluid is fed into the fluid cylinder 82 to extend the piston rod and raise the elevating plate 83.

As the elevating plate 83 rises, the bead B is lifted. At this time, the bead discharge fluid cylinder 12
Injecting pressure fluid into the fluid cylinder 89 to extend the piston rod and forcing the upper part of the bead B outward by the ejection rod 122, then injecting pressure fluid into the fluid cylinder 89 to contract the piston rod, Swinging the swinging arm 87 clockwise,
When the rollers 92, 92' are returned to their original upright position and the lower portion of bead B is released, bead B falls into a soft landing onto the receiver and becomes aligned.

One process of bead forming is completed by the series of operations described above.

As described above, the present invention is centered on the bead drive roller 50 that supports and rotates the bead wire B in a suspended manner, and includes the bead filler supply guide mechanism 2, the crimping roller mechanism 4, the flipper end advancing mechanism 7, and the flipper crimping mechanism 5. Since each mechanism is arranged in an organically related manner, the process of crimping and integrating the elongated bead filler A having the sword tip onto the outer circumferential surface of the bead wire B is completed. Flipper 1 in the step of crimping the flipper 140 to the inner peripheral surface of the bead wire of the bead core
The process of crimping the bead wire B and the bead filler A to both sides of the bead wire B and the bead filler A can be performed automatically and continuously, and the bead filler continuously extruded from the rubber extruder can be cut and the ends of The bead forming process can be performed automatically without requiring any human labor other than gluing.

Furthermore, each of the mechanisms described above can be compactly assembled above, front and rear of the bead drive roller 50, which has the advantage of not requiring a large installation space.

In particular, the present invention provides two pressure roller mechanisms 4 for integrating the tall bead filler A with the bead wire B, which are provided symmetrically on both sides of the bead filler A, which is paid out in an upright manner with the tip of the blade facing upward. The pressure rollers 51, 51' are formed by frusto-conical pressure rollers 51, 51'.
Since the base of the bead filler A can be clamped and crimped with the peripheral surface of the bead wire B, the tall bead filler A can be crimped to the outer peripheral surface of the bead wire B while maintaining its normal upright posture.As a result, the shape is stabilized, and neat bead molding is possible.

Furthermore, since the bead filler A and the flipper are crimped at the same time immediately before and after the bead drive roller 50, no deformation occurs and efficient molding is achieved.

[Brief explanation of the drawing]

Each figure shows an embodiment of the device of the present invention, in which Figure 1 is a front view showing the overall structure, Figure 2 is a plan view of the bead filler supply and guide mechanism, and Figure 3 is the left side of the guide roller in Figure 2. 4 is a side view of the pressure roller mechanism, FIG. 5 is a front view of the same, FIG. 6 is a front view of the bead lower holding mechanism, FIG. 7 is a side view of the same, and FIG. 8 is the flipper end forward pressure welding. FIG. 9 is a front view of the mechanism, FIG. 9 is a side view thereof, and FIG. 10 is a side view of the bead discharge means. A... Bead filler, B... Bead wire, 2... Bead filler supply guide mechanism, 4...
Pressure roller mechanism, 5...Flipper pressure mechanism, 7
... Clipper end forward pressure contact mechanism, 50 ... Bead drive roller, 51, 51' ... Pressure roller, 7
0,70'...Conical roller.

Claims (1)

[Claims] 1. A bead drive roller 50, which has a ring groove in the central part and allows the endless bead wire B to engage in the ring groove and rotate in a suspended manner, the bead filler A extruded from a rubber extruder, with the tip thereof facing upward. A bead filler supply guide mechanism 2 supports the bead filler supply guide mechanism 2 on the bottom and both sides to hold it upright and horizontally advance it to just before the bead wire support point of the bead drive roller 50, two pressure rollers 51, 51' while holding the bead filler A fed out from the bead filler supply guide mechanism 2 sequentially from the tip on both sides,
A pressure roller mechanism 4 for pressure-bonding the outer peripheral surface of the bead wire B on the bead drive roller 50, and a flipper 1
40 is attached to the inner circumferential surface of the bead wire B in front of the bead drive roller 50 so that their mutual width centers match, and the flipper end advance pressure welding mechanism 7 is configured to feed out the cut end toward the bead drive roller 50, and the bead drive Two actively driven conical rollers 70 are arranged oppositely on both sides of the bead wire B behind the bead wire support point of the roller 50 so as to be able to approach and separate from each other.
The flipper 140, whose center portion in the width direction is pressed onto the inner circumferential surface of the bead wire B by 70', is pressed onto both sides of the bead wire B and the bead filler A, respectively. pressure roller 5
1 and 51' are formed from a pair of left and right truncated conical rollers that are rotatably supported by a sliding means that vertically moves up and down, and the bead filler A pressing surface thereof is adapted to the pressed surface of the bead filler A. The inclination angle is adjustable so that the bead drive roller 50 is horizontally symmetrically arranged so as to be able to approach and separate from it, and during the pressing process of the bead filler A, they are close to each other, and when the pressing process is completed, A bead forming device characterized in that the device is operated so as to be separated from each other.